US3814742A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Acrylamide-styrene copolymerization by high-speed shear agitation of aqueous medium containing poly-acrylamide
Assignee: Wyeth Holdings LLC
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Filing: 1973-03-23
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Granted: 1974-06-04
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Expires: 1993-03-23
Abstract
Abstract ACRYLAMIDE IS COPOLYMERIZED WITH STYRENE IN OXYGENFREE AQUEOUS MEDIUM CONTAINING A STYRENE-SOLUBLE INITIATOR AND 0.2% BY WEIGHT OF A POLYACRYLAMIDE HAVING A MOLECULAR WEIGHT ABOVE 500,000, THE MIXTURE BEING AGITATED BY A SHEAR-TYPE STIRRER HAVING A TIP-SPEED ABOVE 15 FT./SEC.
Inventors
- 👤 D Nagy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 02:47
CPC Classifications
C; C08; C08F; C08F212/00; C08F212/02; C08F212/04; C08F212/06; C08F212/08; C08F20/00; C08F20/02; C08F20/52; C08F20/54; C08F20/56
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-06-03 | 1977-12-03 | 1978-06-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-03 | 1981-12-03 | 1982-06-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-03 | 1985-12-03 | 1986-06-04 | $7700.00 | Window Closed / Lapsed |